Blank for forming a tray



FIG. 1 is a top plan view of a blank for forming a tray, showing my new design.

FIG. 2 is a top perspective view thereof; and,

FIG. 3 is a top perspective view of an assembled tray formed from the blank of FIG. 1.

The broken lines present in the drawings depict fold lines and form no part of the claimed design. 

CLAIM The ornamental design for a blank for forming a tray, as shown and described. 